Gábor Tar came recently back to composition after a 30-year break. He started his career with two prizewinners in 1975 (P0505993, YACPDBid=38744).
Gábor recently published also a booklet on the occasion of his 70th birthday. This book "Logika & Harmónia" (in Hungarian, but with many problems) can be downloaded from here and the introduction translated in English, here.

Paul Valois is better known as an excellent writer in The Problemist, where he skillfully managed several columns. His intense activity in former PCCC, supporting John Rice, did not leave him too much time for composing.

Shows black King cross, more difficult theme than the black King star.

André Hazebrouck (06-03-1918) French composer

André Hazebrouck is one of leading's classic retro experts and was the retro editor of French magazine Europe Echecs. He was the first to show the retro-opposition of free knights (see for instance his excellent Die Schwalbe 1st prizewinner with the extensive solution given in PDB's P0000265).

The dualistic path of sS from e6 to b2 contributes to the difficulty. With wPc5,h5 moved to c4,h4 in the diagram, the retroplay would be more precise, but the tries would evaporate. Great solving object.